<template>
  <div class="todo-header">
    <input
      type="text"
      placeholder="请输入任务名称"
      v-model="title"
      @keyup.enter="add"
    />
  </div>
</template>

<script>
import { nanoid } from "nanoid";
export default {
  name: "MyHeader",
  data() {
    return {
      title: "",
    };
  },
  methods: {
    add(e) {
      // console.log(e.target.value);
      if (!this.title.trim()) return alert("输入不能为空");
      console.log(this.title);
      const todoObj = { id: nanoid(), title: e.target.value, done: false };
      this.addTodo(todoObj);
      // 修改dom元素
      // e.target.value = "";
      // 不操作dom元素，直接通过v-model修改数据
      this.title = ""; // 清空输入
    },
  },
  props: ["addTodo"],
};
</script>

<style scoped>
/** header */
.todo-header input {
  width: 560px;
  height: 28px;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 4px 7px;
}
.todo-header input:focus {
  outline: none;
  border-color: rgba(82, 168, 236, 0.8);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075),
    0 0 8px rgba(82, 168, 236, 0.8);
}
</style>
